Turning off machine to do something and now missing data...

What do you normally do if you have to get up to go to the bathroom, or do something? Do you turn the machine off or leave it running without the mask on? I went to bed last night but forgot to fill the humidifier. So I turned it off, got up and filled it, then went back to bed and turned it on. This morning when I download the card, there isn't any data other than how many events I had during the night and the AHI throughout the night. It's an Icon+ Auto. Is that normal?

I haven't had the issue of losing data but I've noticed it will switch back into basic access mode.

I have a ResMed unit...not an Icon. I have never had that problem when I turn off the unit at night.

I always turn the machine off if I need to get up for something; if I leave the machine on while I get up, the machine spikes a great big leak before it automatically turns off ... and it will show up on sleepyhead as a major leak. I've never lost data from sleepyhead results. My machine is a PRS1 60, I don't know anything about the other machines.